Results 71 to 80 of about 5,806 (197)

High Dynamic Range RF Front End with Noise Cancellation and Linearization for WiMAX Receivers [PDF]

, 2012
This research deals with verification of the high dynamic range for a heterodyne radio frequency (RF) front end. A 2.6 GHz RF front end is designed and implemented in a hybrid microwave integrated circuit (HMIC) for worldwide interoperability for ...
Chuang, C.-J., Wu, J.-M., Yeh, C.-H.
core   +1 more source

Laser Ultrasound Super‐Resolution Imaging for Multi‐Parametric Non‐Invasive Volumetric Characterization of Brain Cancer

Advanced Science, Volume 12, Issue 47, December 18, 2025.
Laser ultrasound super‐resolution imaging (LUSSI) leverages laser‐generated ultrasound for functional 3D transcranial imaging of brain tumor vasculature. Combined with optoacoustic tomography, it is demonstrated in a glioblastoma model, revealing structural abnormalities, compressed vessels, hemorrhages, and hypoxic regions.
Daniil Nozdriukhin, Yi Chen, Shuxin Lyu, Daniel Razansky, Xosé Luís Deán‐Ben   +4 more
wiley   +1 more source

Cascaded wavelength conversions using four-wave mixing in semiconductor optical amplifiers [PDF]

, 1997
Wavelength conversion in wavelength-division multiplexed (WDM) communication systems would provide significant network performance improvement. Optoelectronic, cross-gain saturation, and cross phase saturation wavelength converters are candidate ...
Geraghty, David F., Koren, Uzi, Lee, Robert B., Vahala, Kerry J.   +3 more
core  

Low‐Frequency Raman Spectra of Natural Pyrrhotites: Polarization Dependence for Its Lattice Modes

Journal of Raman Spectroscopy, Volume 56, Issue 12, Page 1529-1536, December 2025.
The present study found low‐wavenumber Raman modes of pyrrhotite Fe1‐xS at ~68, ~87, ~117, and ~230 cm−1 for the first time, thanks to a lab‐built Raman spectrometer, in which the optical path of the incident laser was purged by Ar gas. The sufficiently high signal‐to‐noise and signal‐to‐base ratios enabled us to obtain the polarization dependence of ...
Shu‐hei Urashima, Mana Kito, Shiori Nakajima, Kenichi Oguchi, Aruto Kashima, Hiroharu Yui   +5 more
wiley   +1 more source

Robust transport of high‐speed data in a topological valley Hall insulator

Nanophotonics, Volume 14, Issue 27, Page 5047-5057, December 2025.
Abstract Photonic topological insulators provide robust transport of light, enabling interesting phenomena such as unidirectional light propagation and immunity to disorder. The discovery of how to effectively break time reversal symmetry was an important development in the field of photonic topological insulators. Knowledge on how to implement designs
Byoung‐Uk Sohn, George F. R. Chen, Hongwei Gao, Doris K. T. Ng, Dawn T. H. Tan   +4 more
wiley   +1 more source

Time-resolved Spectral Analysis Of Phase Conjugation By Four-wave Mixing In Semiconductor Optical Amplifiers [PDF]

, 1997
Optical phase conjugation provides a mechanism for achieving dispersion compensation in optical fibers. This has been demonstrated by four-wave mixing (FWM) in both fiber and semiconductor optical amplifiers (SOAs).
Geraghty, David F., Lee, Robert B., Mathur, Atul, Vahala, Kerry J., Verdiell, Marc, Ziari, Mehrdad   +5 more
core  

Thermo‐Optically Tunable Mid‐Infrared Bandpass Filters Comprising Ultra‐Thin Silicon‐on‐Sapphire Metasurfaces

Laser &Photonics Reviews, Volume 19, Issue 21, November 6, 2025.
Ultra‐thin, tunable bandpass filters are a pathway to realizing mid‐infrared spectrometers that are compact, low power, and performant. The authors elicit 141 nanometres of passband tunability in the mid‐infrared in silicon on sapphire zero‐contrast gratings by exploiting silicon's high thermo‐optic coefficient.
Benjamin J. Russell, Sivacarendran Balendhran, Jiajun Meng, Kenneth B. Crozier   +3 more
wiley   +1 more source

A Compact UWB Bandpass Filter using Hybrid Fractal Shaped DGS

Journal of Microwaves, Optoelectronics and Electromagnetic Applications
In this paper, a novel and compact ultra wideband (UWB) bandpass filter (BPF) based on fractal-shaped defected ground structure (DGS) is designed and developed.
Babu Lal Shahu, Neela Chattoraj, Srikanta Pal, Dileep Kumar Upadhyay   +3 more
doaj   +1 more source

A silicon implementation of the fly's optomotor control system [PDF]

, 2000
Flies are capable of stabilizing their body during free flight by using visual motion information to estimate self-rotation. We have built a hardware model of this optomotor control system in a standard CMOS VLSI process. The result is a small, low-power
Harrison, Reid R., Koch, Christof
core   +1 more source

Auralization of Amplitude Modulated Helicopter Flyover Noise [PDF]

Rotorcraft noise is an active field of study as the sound produced by these vehicles is often found to be annoying. A means to auralize rotorcraft flyover noise is sought to help understand the factors leading to annoyance.
Aumann A.R., Basner M., Farassat F., Krishnamurthy S., Krishnamurthy S., Pera N.M., Rizzi S.A., Rizzi S.A., Stephenson J.H., Vorländer M.   +9 more
core   +2 more sources